/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkNoDrawCanvas_DEFINED
#define SkNoDrawCanvas_DEFINED

#include "include/core/SkCanvas.h"
#include "include/core/SkCanvasVirtualEnforcer.h"

struct SkIRect;

// SkNoDrawCanvas is a helper for SkCanvas subclasses which do not need to
// actually rasterize (e.g., analysis of the draw calls).
//
// It provides the following simplifications:
//
//   * not backed by any device/pixels
//   * conservative clipping (clipping calls only use rectangles)
//
class SK_API SkNoDrawCanvas : public SkCanvasVirtualEnforcer<SkCanvas> {
public:
    SkNoDrawCanvas(int width, int height);
    SkNoDrawCanvas(const SkIRect &);

    // Optimization to reset state to be the same as after construction.
    void resetCanvas(int w, int h)
    {
        this->resetForNextPicture(SkIRect::MakeWH(w, h));
    }
    void resetCanvas(const SkIRect &rect)
    {
        this->resetForNextPicture(rect);
    }

protected:
    SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec &rec) override;
    bool onDoSaveBehind(const SkRect *) override;

    // No-op overrides for aborting rasterization earlier than SkNullBlitter.
    void onDrawAnnotation(const SkRect &, const char[], SkData *) override {}
    void onDrawDRRect(const SkRRect &, const SkRRect &, const SkPaint &) override {}
    void onDrawDrawable(SkDrawable *, const SkMatrix *) override {}
    void onDrawTextBlob(const SkTextBlob *, SkScalar, SkScalar, const SkPaint &) override {}
    void onDrawPatch(const SkPoint[12], const SkColor[4], const SkPoint[4], SkBlendMode, const SkPaint &) override {}

    void onDrawPaint(const SkPaint &) override {}
    void onDrawBehind(const SkPaint &) override {}
    void onDrawPoints(PointMode, size_t, const SkPoint[], const SkPaint &) override {}
    void onDrawRect(const SkRect &, const SkPaint &) override {}
    void onDrawRegion(const SkRegion &, const SkPaint &) override {}
    void onDrawOval(const SkRect &, const SkPaint &) override {}
    void onDrawArc(const SkRect &, SkScalar, SkScalar, bool, const SkPaint &) override {}
    void onDrawRRect(const SkRRect &, const SkPaint &) override {}
    void onDrawPath(const SkPath &, const SkPaint &) override {}

    void onDrawImage2(const SkImage *, SkScalar, SkScalar, const SkSamplingOptions &, const SkPaint *) override {}
    void onDrawImageRect2(const SkImage *, const SkRect &, const SkRect &, const SkSamplingOptions &, const SkPaint *,
        SrcRectConstraint) override
    {}
    void onDrawImageLattice2(const SkImage *, const Lattice &, const SkRect &, SkFilterMode, const SkPaint *) override
    {}
    void onDrawAtlas2(const SkImage *, const SkRSXform[], const SkRect[], const SkColor[], int, SkBlendMode,
        const SkSamplingOptions &, const SkRect *, const SkPaint *) override
    {}

    void onDrawVerticesObject(const SkVertices *, SkBlendMode, const SkPaint &) override {}
    void onDrawShadowRec(const SkPath &, const SkDrawShadowRec &) override {}
    void onDrawPicture(const SkPicture *, const SkMatrix *, const SkPaint *) override {}

    void onDrawEdgeAAQuad(const SkRect &, const SkPoint[4], QuadAAFlags, const SkColor4f &, SkBlendMode) override {}
    void onDrawEdgeAAImageSet2(const ImageSetEntry[], int, const SkPoint[], const SkMatrix[], const SkSamplingOptions &,
        const SkPaint *, SrcRectConstraint) override
    {}

private:
    using INHERITED = SkCanvasVirtualEnforcer<SkCanvas>;
};

#endif // SkNoDrawCanvas_DEFINED
